A plug of an artificial insemination tube for livestock breeding includes a leading portion and a viewing portion, each having different color layers or different hardness layers, and being formed by stacking and combining different foam layers. In an artificial insemination for livestock breeding, the plug installed at the front of a sperm delivery duct is inserted into a reproductive organ of the livestock, and secretion or fluid is attached and shown on surfaces of the plug leading portion and the viewing portion with different colors to achieve the effect of detecting the physical and physiological conditions of the livestock. In addition, the leading portion is a foam layer with relatively greater hardness, density, and smoothness, so that the plug may be entered into the female livestock body more easily, and the injection hole will not be deformed easily, so as to improve the smoothness and efficiency of the artificial insemination.本創作係有關一種牲畜用人工授精管之塞頭改良,係指人工授精管的塞頭至少包含有前導部和檢視部,該前導部和檢視部係設有不同顏色層或不同硬度層,該不同顏色或不同硬度的前導部和檢視部,係由不同的發泡層相互疊置結合為一體。據之,對牲畜實施人工授精而將輸精管前端的塞頭插入牲畜生殖器後,透過分泌物或流體分別附著顯示在不同顏色的塞頭前導部和檢視部表面,將可達到檢知牲畜身體或生理狀況的效果;又,以該前導部為較硬質和較密實滑順的發泡層,則塞頭將具有較易進入牲畜母體,且噴孔較不易變形阻塞,進而達到提高人工授精順暢性和效率效果。10‧‧‧輸精管20‧‧‧塞頭201‧‧‧套孔202‧‧‧噴孔203‧‧‧前導部204‧‧‧檢視部
